United Airlines to testify at hearing after violent video surfaces

United Airlines is set to testify at a U.S. House Transportation Committee after a video emerged of a passenger being violently dragged off an overbooked flight. It remains unknown who will be called as witnesses for the hearing, and no date has been set yet. The airline has a deadline from the U.S. Senate Commerce Committee to answer questions about the incident. United apologized for the incident in which Dr. David Dao, 69, was dragged from his seat to make room for crew members on the flight.